钻石
材料科学
微观结构
复合材料
体积热力学
基质(水族馆)
融合
激光器
相对密度
扩散
开裂
冶金
光学
物理
哲学
地质学
海洋学
热力学
量子力学
语言学
作者
Jan Wegner,Alexander Fehr,Sebastian Platt,Stefan Kleszczynski,Gerd Witt,W. Tillmann
标识
DOI:10.1016/j.diamond.2020.108040
摘要
Fabricating diamond metal matrix composites (DMMCs) by means of powder bed fusion of metals using a laser beam (PBF-LB/M) is a new approach to extensively expand the spectrum of geometrical freedom for diamond tools. However, it must be borne in mind that the temperature input has a significant influence on the diamond condition since graphitizations are likely to occur. Therefore, it was analyzed how varying volume energy densities and substrate heating affect the microstructure and the densification of a 316 L stainless steel matrix, which was impregnated with 5 vol.-% Ni-coated diamonds. With regard to the densification, it was shown that an elevated substrate temperature (473 K) allowed to apply reduced volume energy densities and reduce stress-induced cracking. Thus, a relative density of 99.5% could be achieved. Furthermore, decreasing the volume energy density avoided graphitizations of the diamonds. Cr and Fe contents of the matrix material dissolved at the Ni-coated diamond surface revealing a diamond-metal interaction. A longer heat flux generally supported these diffusion processes at the interfaces. Finally, it became obvious that increased laser powers resulted in a higher densification, while low scan speeds and laser powers are desirable to foster diffusion and to avoid graphitizations.
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